:root {
    --primary: #00668b;
    --secondary: #00a4d6;
    --light-bg: #f9f9f9;
    --dark-text: #222;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Inter", sans-serif;
    color: var(--dark-text);
    background-color: white;
    line-height: 1.6;
}

/* Header */
.header {
    background: white;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 8%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    color: var(--primary);
    cursor: pointer;
}

.logo img {
    height: 80px;
    width: auto;
    max-width: 100%;
    object-fit: contain;
}

.nav a {
    margin-left: 20px;
    color: var(--dark-text);
    text-decoration: none;
    font-weight: 500;
}

.nav a:hover {
    color: var(--primary);
}

/* Hero */
.hero {
    position: relative;
    background: url("images/driver_banner.webp") center/cover no-repeat;
    color: white;
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: left;
    padding: 0 5%;
}

.hero .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 102, 139, 0.6); /* lớp phủ xanh mờ giúp chữ nổi bật */
}

.hero-content {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    z-index: 1;
    gap: 40px;
}

.hero-text {
    flex: 1 1 450px;
}

.hero-text h1 {
    font-size: 2.2rem;
    margin-bottom: 20px;
}

.hero-text p {
    font-size: 1.1rem;
    margin-bottom: 30px;
}

.cta {
    display: flex;
    gap: 15px;
}

.btn-primary,
.btn-secondary {
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 600;
    transition: 0.3s;
}

.btn-primary {
    background: white;
    color: var(--primary);
}

.btn-primary:hover {
    background: #f1f1f1;
}

.btn-secondary {
    border: 2px solid white;
    color: white;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.hero-image img {
    width: 350px;
    border-radius: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

/* Features */
.features {
    background: var(--light-bg);
    padding: 80px 0;
    text-align: center;
}

.features h2 {
    color: var(--primary);
    margin-bottom: 40px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.feature {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
}

.feature img {
    width: 100%;
    max-width: 220px;
    margin-bottom: 15px;
}

/* Guide */
.guide {
    padding: 80px 8%;
}

.guide h2 {
    color: var(--primary);
    margin-bottom: 20px;
    text-align: center;
}

.guide ol {
    max-width: 700px;
    margin: auto;
    font-size: 1.1rem;
    line-height: 1.8;
}

/* Subscription */
.subscription {
    background: var(--light-bg);
    padding: 80px 8%;
    text-align: center;
}

.subscription h2 {
    color: var(--primary);
    margin-bottom: 40px;
}

.plans {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}

.plan {
    background: white;
    border-radius: 12px;
    padding: 30px;
    width: 380px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
}

.plan.highlight {
    border: 3px solid var(--primary);
}

.plan h3 {
    color: var(--primary);
    margin-bottom: 10px;
}

.plan ul {
    list-style: none;
    margin: 20px 0;
    text-align: left;
}

.plan ul li {
    margin-bottom: 10px;
}

/* Footer */
.footer {
    background: var(--primary);
    color: white;
    text-align: center;
    padding: 30px 8%;
}

.footer a {
    color: white;
    text-decoration: underline;
}